Valve-face-cutting tool



H. F. MARTIN.

VALVE FACE CUTTING TOOL.

APPLICATION FILED JULYIZ, 191s. RENEWED FEB. 13.1920,

1,344,550. Patentd June 22, 1920.

112726-5565 gwpewtoz UNITED STATES HARRY F. MARTIN, OF UTIGA, KANSAS.

VALVE-FACE-CUTTING TOOL.

Specification bf Letters Patent.

Patented J une 22, 1920.

Application filed July 12, 1918, Serial No. 24%,597. Renewed February 13, 1920. .Serial No. 358,410.

To all whom c'tmay concern:

Be it known that I, HARRY F. MARTIN, a citizen of the United States, residing at Utica, in the county of Ness and State of Kansas, have invented new and useful Improvements in Valve-Face-Cutting Tools, of

which the following is a specification. This invention relates to valve cutting the action of hot carbon deposits on the valve faces and valve seats, and the working faces of the valves have to be reground.

Unless this is carefully done by an expert, the working faces of the valves become out of true and it, therefore, becomes necessary to recut or reface the valve in orderthat it may be accurately ground to its seat.

The object of the present invention is to produce a valve holding and face cutting tool which may be clamped in a vise or fastened to a work bench or other support, by means of which a valve may be supported for turning movement and quickly cut to a true face.

Another object of the invention is to pro vide means for gaging the out of the valve face so that the length of the valve stem and the depth or taper of the working face of the valve may be accurately determined.

With the above and other objects in view, the invention consists in the construction, combination and arrangement of parts, as herein described, illustrated and claimed.

In the accompanying drawing:

Figure 1 is a side elevation of the valve cutting tool, showing the relation of a valve thereto.

Fig. 2 is a perspective view of the tool detached, showing the relation of a valve thereto in dotted lines.

Fig. 8 is a perspective view of the valve cutting tool showing a valve and its stem in proper relation thereto in dotted line.

The improved tool is formed in the main of a single piece of metal in the form of a strip of suitable length, width and thickness. The main body of the tool may be formed of stock material in the form of bar or strap steel, the same being bent to form a substantially straight base or main body portion 1 formed with holes 2 to receive fastening devices, such as screws by means of which the body of the tool may be securely fastened in a fixed position in relation to a work bench for example. The body 1 may also be clamped between the jaws of a vise in order to hold the same stationary.

One end portion of the strip from which the tool is formed, is bent at an angle to forma bearing end portion 3 having a hearing opening 4 designed to receive the stem 5 of a valve 6. Beyond the opening 4, the stock of the material is bent at an inclination or oblique angle to form a guiding portion 7 having a cutter 8. The pitch or incl1nation of the cutting portion 7 agrees with the proper taper or bevel of the working face 9 of the valve 6 as clearly indicated in Fig. 1. Therefore, no adjustment is ever needed with respect to the angle or pitch of the cutting portion of the tool.

The other end portion of the tool is bent into U-shape to provide substantially parallel portions 10 and 11 which are substantially at a right angle to the base 1. The inner portion 9 of such U-shaped end portion of the tool is formed with a bearing opening 12 for the stem 5 of the valve. The outer angular end portion 11 is threaded to receive an adjustable gage 13 in the form of a screw having a head 14: and adapted when adjusted to be held in fixed relation to the body of the tool by a lock nut 15. The inner end of the adjustable gage 13 is beveled or tapered as shown at 16 and serves as an abutment or stop for the adjacent end of the valve stem 5. The main body of the device is formed of steel and is primarily of uniform transverse dimensions throughout, thus enabling the tool to be economically produced. No adjustment of the cuting portion of the tool is ever required, and only a sin le adjustment of the gage 13 is necessary to enable all of the valves of an engine to be ground properly with stems of uniform length for proper cooperation of the push rods or tappets of the engine. By means of the improved tool, a valve face may be ground perfectly true just as in a lathe.

The main body 1 of the tool may be cheaply manufactured out of soft cold rolled steel, in which case, the cutting edge of the devi-ce will be formed or a separate piece or plate 8" composedof tool steel, said piece or plate being formed with holes 8 and the or plate 8 may be substituted for one that is too far wOrnfOr other use, whenever necessary. p

I claiin: V ,1. A valve cutting tool composed of a strip of tool steel of uniform transverse dimensions'having one end. portion thereof bent substantially at a right angle and then at an oblique angle, such right angular portion being formed with a bearing opening for the stem ofthe valve, and such oblique having a cutter for the working face of the valve, the other end portion being bent substantially at a right angle and formed with a bearing opening for the valve stem.

. 2. A valve cutting tool composed of a strip of tool steel of uniform transverse dimensions having one end portion thereof bent substantially at a right angle and then at an oblique angle, such right angular'portion being formed with. a bearing opening forthe stem of the valve, and such oblique having a cutter for the working face of the valve, the other end portion being bent substantially at a right engle and formed with 'a bearing opening for the valve stem,the last named end portlo'n heing extended'to form a U-shaped bend with an end portion substantially parallel to the other. right angular end portions of the tool body, and an adjustable'gage supported by the last named end portion and serving as .a' stop for the extremity ofthe valve'stem'. V

In testimony whereof I afiixmy signature.

HARRY r. ivn nrrn. 

